/*
 * Copyright (c) "Neo4j"
 * Neo4j Sweden AB [https://neo4j.com]
 *
 * This file is part of Neo4j.
 *
 * Neo4j is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program.  If not, see <https://www.gnu.org/licenses/>.
 */
package org.neo4j.cypher

import org.neo4j.cypher.internal.util.test_helpers.CypherFunSuite

import java.util.Properties

class SystemPropertyTestSupportTest extends CypherFunSuite {

  trait SystemPropertyTestSupportFixture extends SystemPropertyTestSupport {
    val systemProperties = new Properties()

    override def getSystemProperty(propertyKey: String): (String, String) =
      (propertyKey, systemProperties.getProperty(propertyKey))

    override def setSystemProperty(property: (String, String)): (String, String) = property match {
      case (k, v) => (k, stringValue(systemProperties.setProperty(k, v)))
    }

    private def stringValue(value: AnyRef) =
      if (null == value) {
        null
      } else {
        value.toString
      }
  }

  test("should get system properties") {
    (new SystemPropertyTestSupportFixture {
      def apply(): Unit = {
        setSystemProperty("os.name" -> "Linux")
        getSystemProperty("os.name") should equal(("os.name", "Linux"))
      }
    })()
  }

  test("should return previous value when setting system properties") {
    (new SystemPropertyTestSupportFixture {
      def apply(): Unit = {
        setSystemProperty("os.name" -> "Linux")
        setSystemProperty("os.name" -> "Mac OS") should equal(("os.name", "Linux"))
      }
    })()
  }

  test("should shadow system properties") {
    (new SystemPropertyTestSupportFixture {
      def apply(): Unit = {
        setSystemProperty("os.name" -> "Linux")
        withSystemProperties("os.name" -> "Windows") {
          getSystemProperty("os.name") should equal(("os.name", "Windows"))
        }
      }
    })()
  }

  test("should restore system properties") {
    (new SystemPropertyTestSupportFixture {
      def apply(): Unit = {
        setSystemProperty("os.name" -> "Linux")
        withSystemProperties("os.name" -> "Windows") {
          setSystemProperty("os.name" -> "Mac OS")
        }
        getSystemProperty("os.name") should equal(("os.name", "Linux"))
      }
    })()
  }
}
